BC Racing D-05 BR Coilovers for 91-96 Infiniti G20, installation instructions and needed components are included in the box. BC Racing manufacturers suspension components that are suitable for both street driving as well as the spirited occasional road course or autocross duty. All BC coilovers come with extremely easy to access adjustment knobs for tuning dampening, rebound and height. Depending on the model selected each model will have different adjustment levels. All BC Racing suspension kits come with the option for the Extreme Low kit (this lowers the suspension roughly another 2″ from the standard kit). Swift springs are another option that is made available to all BC racing suspension components, with this customization option users can choose to increase or decrease spring rates to their desired rating.